Lubricant



Patented May a 1930 UNITED s AT s PATENT. OFFICE- SAMUEL '1. SHE-BRICK,01 DENVER, COLORADO, ASSIGNOR TO EDWIN S. KASSLER, 3B,,

AND THOMAS P. CAMPBELL, TRUSTEES, OF DENVER, COLORADO No Drawing.

This invention relates to a composition of matter particularly adaptedfor use as a lubricant of the kind commonly known as hard oil or packinggrease. v

An object of the inveninon is-to provide a lubricant which is of simplecomposition and which by reason of the cheapness and abundance of itsprincipal ingredient can be produced at very low cost.

Another object is to provide a lubricant having high stability, bothphysical and chemical, and a further ob ect is to prov de a hard oil orpackinggrease havinghigh lubricant power and'capable of forming a filmof great compressive strength.

With the above and other objects vlew, the composition has as itsprincipal ingredient,-a colloidal or jelly-formlng clay such asbentonite (AlgO3-6SiO2-5H20) or other hydrated silicate of aluminum. v

The composition involves the use of a plastic mineral substance havingas components,

a gelatinous colloid, a mineral salt and a water insoluble clay in astate of fine subdivision. Bentonite or other clay of similar naturelends itself particularly to the production of the desired substance. Tostill better adapt the colloidal clay for use in preparing a compositionof the above-stated character it is subjected to an acid treatment forthe production of ortho-silicic acid.

The natural clays contain a considerable.

amount of combined silicic acidand by treating the material with acomparatively stronger acid, part or all of the silicic acid may bedisplaced and precipitated, in acidic environment, as gelatinousortho-silicic acid w mq Sulfuric acid is well adapted for the acidtreatment of the clays although other acids,-

particularly those which form a water soluble salt of aluminum, such ashydrochloric or glacial acetic may be used in variant proportions withsatisfactory results.

The clays after the acid treatment yield a compound of colloidal clay,aluminum sulfate, ortho-silicic acid and water that meets all therequirements for the production of a lubricant of the hereinbeforedescribed properties.

App1ication filed October 25, 1927. 'Serial No. 228,697.

The lubricant has for its other ingredients water and lubricating oiland its components in a desirable form are mixed in the followingproportions: Bentonite 7 parts, water 7 parts, and lubricating oil 12parts.

If the colloidal clay is subjected to an acid treatment the proportionsmay be as-follows:

Parts Bentonite v -,-S ulfuric acid (concentrated C. P.) 1 ater 5Lubricating oil 12 The first three ingredients are mixed thoroughly to'form a homogeneous pulp afterwhich the engine oil is added.

Every efi'ort must be made to attain a very fine state of subdivision ofsolids, which may be accomplished by grinding the pulp in a pebble millin more than enough oil to saturate the clay. The oil in excess of theamount that can be held b the clay used then may be removed in a terpress.

It is possible to use for the oil ingredient of the composition, lowgrade lubricating oils and crank casedrainings and as a general rule,mineral oils are better adapted for the urpose than animal or vegetableoils.

aving thus described my invention, what I claim and desire to secure byLetters Patcomposition consisting in grinding a pulpous mixture ofcolloidal clay, an acid stronger than silicic acid thereby producingorthosilicic acid and water to a fine state of subdivision of solids, inthe presence oflubrieating oil, and removing the excess oil byfiltration.

6. A lubricant containin colloidal clay, water, ortho-silicic acid,uminum sulfate and lubricating oil.

7. A lubricant composition com rising a gelatinous colloidal claytreated wit an acid 5 stronger than silicic acid whereby the latter isdisplaced as ortho-silicic acid, water and lubricating oil.

8. A lubricant comprising a gelatinous colloidal clay treated wlth sfurlc acid, water and lubricating oil.

'9. A lubricant composition comprising bentonite treated with an acidstron er than silicic acid whereb the latter is splaced 16 aialortho-silicic aci water and. lubricating o 10. The hereindescribedfprocess com risin the treating of aluminum silicate wit anacid stronger than silicic acid, thereby producing ort o-silicic acid,and mixing it with water and lubricating oil.

11. A lubricant compositionvcomprising a colloidal clay containingdisplaced ortho-silicic acid, water and lubricatmg oil.

In testimony whereof I have afiixed my gn SAMUEL T. SHERRICK.

